.TH SIN 2.SH NAMEsin, cos, tan, asin, acos, atan, atan2 \- trigonometric functions.SH SYNOPSIS.B #include <u.h>.br.B #include <libc.h>.PP.Bdouble sin(double x).PP.Bdouble cos(double x).PP.Bdouble tan(double x).PP.Bdouble asin(double x).PP.Bdouble acos(double x).PP.Bdouble atan(double x).PP.Bdouble atan2(double y, double x).SH DESCRIPTION.I Sin, cosand.I tanreturn trigonometric functions of radian arguments.The magnitude of the argument should be checkedby the caller to make sure the result is meaningful..PP.I Asinreturns the arc sine in the range\-π/2 to π/2..PP.I Acosreturns the arc cosine in the range0 to π..PP.I Atanreturns the arc tangent in the range\-π/2 to π/2..PP.I Atan2returns the arc tangent of.I y/xin the range\-π to π..SH SOURCE.B /sys/src/libc/port.SH SEE ALSO.IR intro (2).SH BUGSThe value of.I tanfor arguments greater than about.if t 2\u\s-231\s+2\d.if n 2^31is garbage.